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Miller" , Maxime Coquelin , "Alexandre Torgue" , , , CC: Benjamin Gaignard , Fabien Dessenne , Ludovic Barre Subject: [PATCH 3/3] crypto: stm32/crc - Add power management support Date: Tue, 26 Jun 2018 14:52:46 +0200 Message-ID: <1530017566-14779-4-git-send-email-lionel.debieve@st.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1530017566-14779-1-git-send-email-lionel.debieve@st.com> References: <1530017566-14779-1-git-send-email-lionel.debieve@st.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.201.23.65] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-06-26_07:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Adding pm and pm_runtime support to STM32 CRC. Signed-off-by: Lionel Debieve --- drivers/crypto/stm32/stm32_crc32.c | 62 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) diff --git a/drivers/crypto/stm32/stm32_crc32.c b/drivers/crypto/stm32/stm32_crc32.c index 8f09b84..04ba5e1 100644 --- a/drivers/crypto/stm32/stm32_crc32.c +++ b/drivers/crypto/stm32/stm32_crc32.c @@ -8,6 +8,7 @@ #include #include #include +#include #include @@ -32,6 +33,8 @@ #define POLY_CRC32 0xEDB88320 #define POLY_CRC32C 0x82F63B78 +#define CRC_AUTOSUSPEND_DELAY 50 + struct stm32_crc { struct list_head list; struct device *dev; @@ -106,6 +109,8 @@ static int stm32_crc_init(struct shash_desc *desc) } spin_unlock_bh(&crc_list.lock); + pm_runtime_get_sync(ctx->crc->dev); + /* Reset, set key, poly and configure in bit reverse mode */ writel_relaxed(bitrev32(mctx->key), ctx->crc->regs + CRC_INIT); writel_relaxed(bitrev32(mctx->poly), ctx->crc->regs + CRC_POL); @@ -115,6 +120,9 @@ static int stm32_crc_init(struct shash_desc *desc) ctx->partial = readl_relaxed(ctx->crc->regs + CRC_DR); ctx->crc->nb_pending_bytes = 0; + pm_runtime_mark_last_busy(ctx->crc->dev); + pm_runtime_put_autosuspend(ctx->crc->dev); + return 0; } @@ -126,6 +134,8 @@ static int stm32_crc_update(struct shash_desc *desc, const u8 *d8, u32 *d32; unsigned int i; + pm_runtime_get_sync(crc->dev); + if (unlikely(crc->nb_pending_bytes)) { while (crc->nb_pending_bytes != sizeof(u32) && length) { /* Fill in pending data */ @@ -149,6 +159,9 @@ static int stm32_crc_update(struct shash_desc *desc, const u8 *d8, /* Store partial result */ ctx->partial = readl_relaxed(crc->regs + CRC_DR); + pm_runtime_mark_last_busy(crc->dev); + pm_runtime_put_autosuspend(crc->dev); + /* Check for pending data (non 32 bits) */ length &= 3; if (likely(!length)) @@ -272,6 +285,13 @@ static int stm32_crc_probe(struct platform_device *pdev) return ret; } + pm_runtime_set_autosuspend_delay(dev, CRC_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(dev); + + pm_runtime_get_noresume(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + platform_set_drvdata(pdev, crc); spin_lock(&crc_list.lock); @@ -287,12 +307,18 @@ static int stm32_crc_probe(struct platform_device *pdev) dev_info(dev, "Initialized\n"); + pm_runtime_put_sync(dev); + return 0; } static int stm32_crc_remove(struct platform_device *pdev) { struct stm32_crc *crc = platform_get_drvdata(pdev); + int ret = pm_runtime_get_sync(crc->dev); + + if (ret < 0) + return ret; spin_lock(&crc_list.lock); list_del(&crc->list); @@ -300,11 +326,46 @@ static int stm32_crc_remove(struct platform_device *pdev) crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); + pm_runtime_disable(crc->dev); + pm_runtime_put_noidle(crc->dev); + clk_disable_unprepare(crc->clk); return 0; } +#ifdef CONFIG_PM +static int stm32_crc_runtime_suspend(struct device *dev) +{ + struct stm32_crc *crc = dev_get_drvdata(dev); + + clk_disable_unprepare(crc->clk); + + return 0; +} + +static int stm32_crc_runtime_resume(struct device *dev) +{ + struct stm32_crc *crc = dev_get_drvdata(dev); + int ret; + + ret = clk_prepare_enable(crc->clk); + if (ret) { + dev_err(crc->dev, "Failed to prepare_enable clock\n"); + return ret; + } + + return 0; +} +#endif + +static const struct dev_pm_ops stm32_crc_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) + SET_RUNTIME_PM_OPS(stm32_crc_runtime_suspend, + stm32_crc_runtime_resume, NULL) +}; + static const struct of_device_id stm32_dt_ids[] = { { .compatible = "st,stm32f7-crc", }, {}, @@ -316,6 +377,7 @@ static struct platform_driver stm32_crc_driver = { .remove = stm32_crc_remove, .driver = { .name = DRIVER_NAME, + .pm = &stm32_crc_pm_ops, .of_match_table = stm32_dt_ids, }, }; -- 2.7.4